Honestly, rebranding is a major endeavor that you should only do if it's absolutely necessary. There are two main costs that you will incur here: the actual money to rebrand as well as the sales loss. Here's what you need to know. 

1) A typical branding agency will charge between 10 to 20 percent of your company's marketing budget for a full-scale rebranding. This translated to $75,000 to $150,000 for a typical medium-sized business. 

2) It can take anywhere from six to eight months for most companies to see the full rebranding in effect. If your company is extremely well-known in your niche, it can take 1 to 2 years for the new brand to take hold. 

3) How drastic of a rebranding you do also matters as well as the size of your company. If you've been operating for 20 years as Company A and then become Company B, then you need to expect a sudden drop in your client base. Old customers may not resonate with your new image. 

While rebranding absolutely has a place in the world of business, the truth is that it's something you should not consider unless you have a lot of problems plaguing your brand. Before you pull the trigger on this, make sure it's absolutely necessary. Otherwise, you are going to be in for a less than happy moment.